Rock-drill.



PATENTED NOV. 27, 1906'.

J. J. REKAR. ROCKDRILL. APPLICATION FILED APB.13.1906.

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ruz NORRIS No. 837,118. 'PATENTED NOV. 27, 1906. I

J. J. REKAR.

ROCK DRILL.

APPLICATION FILED APB-13.1906.

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THE NORRIS PETERS 90.. wasnzuarou,-zz'c.

No. 837,118. PATENTEDNOV. 27,1906.

J. JQ REKAR. ROCK DRILL.

APPLIUATION FILED APE.13,1906

WITNESSES: INVENTOR A770 EV:

THE mmms PETERS C0,, wnsmnarcn. n c.

UNITED STATES PATENT orrron.

ROCK-DRILL.

No. 837,1 1s.

Specification of Letters Patent.

Patented Nov. 27, 1906.

Application 51 11 April 13, 1906. Serial No. 311,461.

T0 at whom it may concern.-

Be it known that I, JOSEPH J. REKAR, a citizen of the United States,residing in the city and county of San Francisco and .State ofCalifornia, have invented new and useful Improvements in Rock-Drills, ofwhich the following is a specification.

My invention relates to a drill which is especially designed as a handapparatus.

It consists in the combination ofmechanism and in details ofconstruction which will be more fully explained by reference to theaccompanying drawings, in which Figure 1 is a side elevation, partiallyin sec: tion, showing my invention. Fig. 2 is a section on line 0 o ofsame. Figs. 3 andl show a modification of the feed. Fig. 5 is asectional view taken through the cam 24 at right angles to theshaft 1.0.

It is the object of my invention to provide a portable hand-operateddrilling mechan ism.

A is a suitable base or support. In the present case I have shown it inthe form of a plate having guide-channels at each side edge and a shank2, which extends from the plate A into the jaws of a clamp 3. This clamphas a hole through it, which will fit a standard to which it may besecured, the standard being suitably fixed with relation to therock-face to be drilled in any usual or suitable manner.

WVithin the guidelate A the plate 4 is slidably fitted, and t e upturnedend plates 5 carry guides 6, through which the drillshank 7 is guidedand slidable. The drillhead 8, which may be of any suitable or desiredconstruction, is carried at the outer end of the drill-shank, and anysuitable or desired character of drill may be fixed therein.

9 represents plates carryingjournal-boxes supported above the line oftravel. of the drill-shank, and within these journal-boxes a shaft 10 issupported transversely to the line of travel of the drill. The plates 9are clamped to rods 9 which connect the plates 5, Figs. 1 and 2. Thisshaft carries upon one end a sufficiently heavy balancewheel, as

wheel to the pinion, multiplying it to any desired extent. Upon thetransverse shaft in line above the drill-shank is a crank or eccentric15.

16 is a connecting rod or yoke the upper end of which is supported uponthe transverse bar 18, fixed in line above the crankshaft. The crank oreccentric passes through an open slot in this yoke, and it Will be seenthat by the rotation of the crankshaft this yoke will be oscillatedabout its suspending support. The lower end of the yoke has connectionsby which the oscillating motion may be transmitted to reciprocate thedrill-shank and drill. Such a connection is here shown as consisting ofa block 20, carried by a drill-shank having a transverse cylindricalgroove made in its upper surface. Within this groove or channel anoscillating pin or shaft 21 is fitted. From the upper side of this shaftpins 22 extend into corresponding holes made in the bottom of theoscillating yoke 16, and these pins are easily slidable, so that as theyoke oscillates and the block attached to the drill-shank movesalternately away from and toward the end of the yoke it will be seenthat the pins will slide in the holes in the yoke so that the rockingbar or pin which connects with the drill-shank may reciprocate with thedrill-shank and be actuated by the oscillating yoke.

In orderto relieve the shock caused by the rapid reciprocations of thedrill-shank and at the same time to transmit the motion of the yoke tothe shank, I have shown spiral springs 3 1, the inner ends of which abutagainst the slidable block 20. Suitable collars 35 and 35 are designedto hold the springs 84 between themselves and the central slidable block20, and through said springs reciprocating motion is transmitted to thedrill-shank. The collars are also ad justably mounted on the rod 7 toenable the sprin s to be compressed to any desired deree etween thecollars and intermediate block. This arrangement of parts allows thereci rocating motion to be transmitted to the dril -.shank and at thesame time relieving.

the parts of the shock of the rapid motion and also compensating in adegree for variations in the stroke of the drill against the rock.

In order to vary the length of stroke to suit the conditions, Ihaveshown the yoke as having its upper end either slotted or,pe r

forated and means for, adjustingthe pivot,- bar v18 up or down in thestandards and in the de ress this angle of connection.

cam 24, carried by the crank-shaft, and a lever, arm 25 is fulcrumed sothat one end is raised by each contact with the cam. The other endcarries a pawl 26. This pawl engages with a ratchet-wheel 27,throughwhich the drill-shank is slidable and with whichit is connectedby a feather, so that when the pawl-turns the ratchet by eachreciprocation the-drill-shank will also be turned and with it the drill.

Inorder to feed the apparatus forwardas the hole is deepened, variousdevices may be employed. One of such devices I have shownconsisting of arack 28, formed in the bottom of the plate A. A pawl 29 is fillcrumed tothe end of alever=arm 30, so that the point of the awl may engage withthe rack, it being undiarstood that the-drill isdesigned for horizontalwork and is seldom if ever inclined to so great a degree as to allow awlto be disengaged from said rack. Theever-arm 30 is carried upon theplate 4, which is guided and slidable in the plate A. The collar 35,before mentioned, is of somewhat larger diameter than the collar 35 andis of suflicient diameter to enable it to contact with. the angle of thelever-arm 30 to The'other co lar 35 only'acts to return and compressthespring 34 between itself and the block 20.

The depression of the lever-arm extends the pawl to engage with a toothin the rack and to push the frame which carries the drill forward anotch. .A spring a,connecting with the pawl-carryingarm, serves to raisethe an.- gle ofjunction between the arm and the pawl, and thus retractthe point of the pawl after each depression. Thus when the apparatus hasbeen moved forward to com ensate for the advance of the in the hoiia itwill be moved so far that the part carried by the drill-shank whichactuates the awl will not act to move the pawl until the ill has-againadvanced, so that this part will move far enough to actuate the pawl.Thus the feed will be automatic and dependent upon the rapidity of thework.

Various modifications of the feed may be employed, one of which is shownin Figs. 3, 4, in which a worm-gear is introduced between the shaft andthe rack and is operated similarly by the reciprocation of thedrill-shank.

I If the drill is much inclined, it would slide forward upon the supportA, because the pawl 29 and its work 28 only retain it in one direction.To prevent this, I have shown a rack '32 with teeth facing opposite tothe teeth 28. A pawl 31 moves in unison the arm 30. It is disengagedwhen 30 is depressed and the pawl 29 actuated and engages it-s'rack whenthe arm 30 again rises.

Any available motor may furnish power. In Figs. 3 and 4 the lever 48carries the pawl 4'1,which engages the circular ratchetdisk 42, and'ismoved by the collar 35. The ;ratchet disk 42 :is fixed upon ascrew-shaft 44, and this screw engages a gear 40, which gear or one uponthe same shaft engages a rack 28 on the bed A, and will thus advance thedrill.

Having'thus described my invention, what I claim, and desire tosecure byLetters Patent, is- V 1. The combination in adrill, of a'channelguide-plate and support therefcr, a frame slidable in the guides of saidplate, a drillshank, means for reciprocating said shank within theguided frame, a rack carried by the supporting-plate, a pawl carried bythe movable frame and means carried by the reciprocating drill-shank"whereby the pawl is caused toenga'ge the rack and advance the drill andframe, said means includinga'collar upon the drill-shank and a fulcrumedpawlcarrying-leverwith which the collar-contacts.

2. In .a :rock+drill, a frame, a drill and mechanism by whichit isreciprocated'in the frame, a guide=plate in which the drill-frame isslidable, a rack carried by said plate, a pawl, an arm to which saidpawl is 'fulcrumed an enlargement carried by the drill-shank adaptedtoron'tact with thearm' and'depress it and the pawl transverselyandadvance the drill-frame in its guide-plate.

3. In a drilling apparatus, a supported guide-plate having a rack-bar, adrill frame guided and slidable upon the plate, a pawl carried by theframe engaging the rack, a drill-shank slidable in the frame, acrankshaft j ournaled above thedrillsshank, a yoke fulcrumed above thecrank-shaft and having its intermediate portion engaging the crankwhereby it is reciprocated, connection between the lower end of the yokeand the drillshank, and means carried by the drill-shank toactuate thepawl.

4. In a drillmgapparatus, a frame, adrillshank slidable therein, acrank-shaft journaled above the drill-shank, a yoke fulcrumed ,above theshaft and having its intermediate portion engaged by the crank, atransverse pin or shaft having pins extending therefrom and slidable inthe lower end of the yoke, a block fixed to the drill-shank having atransverse groove in which the pin-shaft oscillates, and by which motionis transmitted to, the drill-shank. v

5. In a drilling apparatus, a guided slida- IOC IIC

ble frame, a drill-shank, a boss or enlargement carried by said shankhaving a cylindrical transverse'groove, a pin loosely fitting saidgroove and having upwardly-extending pins connected therewith, a crankor eccentric shaft journaled across the frame above the drill-shank, ayoke fulcrumed above the shaft and slotted to engage the crank oreccentric, said yoke having its lower end perforated to receive the insand transmit motion to the drill-shan r, means for rotating thedrill-shank.

6. In a rock-drill, a frame, a drill slidable in said frame, andmechanism to reciprocate the drill, a base upon which the frame ismovable and a rack thereon and a pawl, a lever to which it is pivoted,mechanlsm actuated by the movement of the drill-shank to move the leverand pawl and advance the drill-carrying frame, a second rack and a pawlacting in unison with and in opposition to the firstnamed pawl to limitthe forward movement of the drill-frame.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

JOSEPH J. REKAR. l/Vitnesses:

S. H. N oURsE, JEssIE C. BRODIE.

